Why are public opinion polls not always accurate?

In my opinion, I think it’s because the poll itself and the people making it will make multiple accounts to pick the one they believe in. That is if you need an account to do it. If you don’t need an account to do the poll people normally do it more than once to get what they want.

Sir thomas more, venerated in the catholic church as saint thomas more, was an english lawyer, social philosopher, author, statesman, and noted renaissance humanist. he was also a councillor to henry viii, and lord high chancellor of england from october 1529 to 16 may 1532. i found this information on wikipedia